In Grand Theft Auto III, Grand Theft Auto: Vice City, Grand Theft Auto: Liberty City Stories, and Grand Theft Auto: Vice City Stories, unnamed commercial/fleet sedan platforms exist solely for use by law enforcement agencies and taxi companies.
The design of the fleet sedans is reflective of the eras in which they exist in. In GTA III and GTA Liberty City Stories, the sedan is seemingly based on a first generation Ford Crown Victoria in the front and a 1991–1996 Chevrolet Caprice in the rear and the body design, while the GTA Vice City and GTA Vice City Stories renditions are based on a 1983–1986 Fox-platform Ford LTD. The GTA III and GTA Liberty City Stories rendition also sports bumpers with changeable colors most noticeable on taxis in GTA Liberty City Stories.
The car is comparable to the GTA San Andreas Premier or GTA IV Merit, but has no version for private consumers, classifying it as being more similar to the Vapid fleet sedan in GTA IV. The FBI variant in GTA Liberty City Stories and the police variant in GTA Vice City Stories however do refer to the sedan as a "Cruiser", implying it is the name of the bare model.
The fleet sedan is designed to provide average-to-good performance, depending on the sedan's usage. Sedans adapted as taxis offer a balance of good acceleration, average top speed and very nimble steering. In addition, they appear to house V6's rather than V8's, based on the sound they emit during acceleration. Law enforcement vehicles are far speedier with improved acceleration and top speed, but are less stable in GTA III and GTA Vice City due to heighten suspensions (a problem that was rectified in subsequent iterations). Law enforcement vehicles also produce a throatier engine sound in comparison to their taxi counterparts, hinting that they may be powered by a V8 engine.
The fleet sedans, as are most sedans, can soak up an average amount of crash damage before exploding.